A seed-aggregate composed from one charmed seed and one ordinary seed is called an ordinary charmedquark. It is represented symbolically using the letter c. Here is a mathematical statement of the definition along with an icon to illustrate the quark.

$\sf{ c \equiv \left\{ C, O \right\} }$

You can usually click on quark icons to come back to a page like this for reference. The charmed anti-quark is defined as the union of one charmed seed with an odd seed.